Three people have died and two others remain in hospital following a crash outside of Darwin.
A 22-year-old man was driving with his wife and three children along Girraween Rd in Darwin's rural area at around 5.50am (CST) on Friday when it veered off the road and hit a pole near the intersection of Azure Court and Girraween Road.
His four year old son and 18-month-old daughter were killed.
A police spokeswoman told AAP it was believed the children were not wearing seatbelts.
The man's 22-year-old partner was critically injured and later died, said Senior Sergeant John Worrall of the Major Crash Investigation Section.
The man and his three-year-old son have been taken to Royal Darwin Hospital in a serious condition.
Investigators are working to establish the exact circumstances surrounding the crash, and police will prepare a report for the coroner.
